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Glossary
3G
- Third Generation network
3G refers to the third generation of mobile telephony technology. The evolution of 3G
technology is as follows:
802.11 (b, g, n)
A set of WLAN communication standards in the 2.4, 3.6 and 5 GHz frequency bands
Access Point
A device that allows wireless communication devices to connect to a wireless Network
using a standard such as Wi-Fi
APN
Access Point Name. The APN is an alphanumeric string that identifies the particular
network service that is being accessed. These are used by GPRS and UMTS networks.
ARP - Address Resolution Protocol
ARP
is a TCP/IP protocol for mapping an IP address to a physical machine address that is
recognized in the local network, such as an Ethernet address.
A host wishing to obtain a physical address broadcasts an ARP request onto the TCP/IP
network. The host on the network that has the IP address in the request then replies with
its physical hardware address.
Inverse ARP (In-ARP), on the other hand, is used by a host to discover its IP address. In
this case, the host broadcasts its physical address and a RARP server replies with the
host's IP address.
BPS - Bits Per Second
The rate of data flow.
Broadband
High-capacity high-speed, transmission channel with a wider bandwidth than
conventional modem lines. Broadband channels can carry video, voice, and data
simultaneously.
CDMA - Code Division Multiple Access
It is the underlying channel access method used by some mobile phone standards.
CDMA technologies
1xRTT offered speeds up to 144 Kbps (2002)
EV-DO increased downlink speeds up to 2.4 Mbps (2004)
EV-DO Rev A boosted downlink speeds to 3.1 Mbps (2006)
EV-DO Rev B can use 2 to 15 channels with each downlink peaking at 4.9 Mbps.
Ultra Mobile Broadband was slated to reach 288 Mbps but operators may switch to
LTE instead.
CDMA EV-DO
A is a leading-edge wireless technology with higher data rates and higher system
capacity. It is a fully backward compatible standard and remains interoperable with
deployed EV-DO networks and devices around the world. The increased data rates on
Rev. A’s physical layer enable richer applications and services.
For more information, visit www.cdg.org.
DHCP (Dynamic Host Configuration Protocol)
When operates as a DHCP server, the Router assign IP addresses to the client PCs on the
LAN. The client PCs “leases” these Private IP addresses for a user-defined amount of
time. After the lease time expires, the private IP address is made available for assigning
to other network devices.
The DHCP IP address can be a single, fixed public IP address, an ISP assigned public IP
address, or a private IP address.
If you enable DHCP server on a private IP address, a public IP address will have to be
assigned to the NAT IP address, and NAT has to be enabled so that the DHCP IP address
can be translated into a public IP address. By this, the client PCs are able to access the
Internet.
DHCP Server
A server or service with a server that assigns IP addresses.
DNS - Domain Name System
A system for converting host names and domain names into
